Gas-service safety-valve.



Pam-md my 22, |902. L. M. usofms.- GAS sEnvlcEVsAFErv VALVE.

(Applicatie): led No?. 30, 1901.) (lla Nudel.)

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UNITED STATES LATHAM M. OSBORNE, OF APOLLO, PENNSYLVANIA.

GSWSERVICE SAFETY-VALVE SPECIFICATION forming part of Lettersatent No.705,125, dated July 22, 1902.

Application fled November 30, 1901. Serial No. 84,255. (No model.)

`to be a full, clear, and exact description of the invention, such aswill enable others skilled' in the art to which it appertains to makeand p use the same. Y

This invention provides a valve of novel construction for automaticallycutting off the supply of gas in the event of the pressure in thesupply-pipe being reduced from any cause,

thereby preventing asphyxiation and the other casualties resulting froma temporary cessation of gas to lighted burners Without affording anopportunity for shutting off the open burner or burners.

For a full description of the invention and the merite thereof and alsoto acquire a knowledge of the details of construction of the means foreffecting the result reference is to be had to the following descriptionand drawings hereto attached.

While the essential and characteristic features of the invention aresusceptible of modification, still the preferred embodiment of theinvention is illustrated in the accompanying drawings, in which-m Figurel is a vertical longitudinal section of a safety-valve embodying theinvention, the valve proper being unseated, so as to allow for a iiow ofgasthrough the valve-casing. Fig. 2 is a view similar to Fig. l, showingthe valve seated. Fig. 3 is a perspective view of the strainer.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

The body or casing l of the valve is provided at opposite points withcoupling ends 2 and 3, whereby attachment is had between the valve andthe inlet-pipe i and outlet-pipe 5. The valve body or casing comprises acylinder or barrel G, open at its upper end and having avalve-seat 7 atits lower end. This barrel or cylinder is bored perfectly true and avalve 8 is freely movable therein and fits the seat 7 by a ground joint.This valve is cup-shaped and of metal and does not bear against thewalls of the barrel or cylinder in such a manner as to interfere withthe automatic action of the valve or necessitate the provision of aspring or weight to'insure seating of the valve when the pressuresupporting the same ceases. Apassage 9 communicates at one end with thelower portion. of the barrel or cylinder 6 and at its opposite end withthe coupling' end 2, whereby communication between the inlet and outletpipes is established under normal conditions. An opening `lO, providedin a side of the barrel or casing intermediate of the ends thereof, isin communication with the coupling end 3. When the valve S is unseated,as shown in Fig. l, the gas from the inlet-pipe i passes into thecylinder 6 through the opening l0, thence outward from said cylinderinto the outlet-pipe 5 by way of the passage 9. The valve 8 is held openby the pressure of the gas in the casing, and in the event of thepressure being reduced by reason of a break in the gas-how or othercause, shutting off the supply of gas, the valve 8, being no longersupported, will fall by its weight and the weight of the stem llattached thereto and become seated, thereby preventing a further iiow ofgas through the valve even though the supply should be restablished.Vhen the supply of gas is shut oif, the flame of the open burner orburners is extinguished, and if no means were provided for preventingthe gas reaching said burners when the supply is established the room orapartment would become filled with escaping gas, thereby e11- dangeringlife by asphyxiation or damage by means of explosion andflre. Thepresent invention prevents the gas reaching the open burner or burnerswhen the supply is restablished, and it is incumbent upon a person topositively move the valve for unseating the same before the supply canbe reestablished through the valve to the outlet-pipe 5.

The upper end of the barrel or cylinder is closed by the head or coverl2,threaded thereto, and this cover has a boss 13 at its top sideapertured to receive the upper end of the valve-stem ll,`and the openingthrough which said stem passes is enlarged at its upper end, as shown at14E, to admit of the stem being conveniently grasped when it is requiredto IOO lift the valve. A cap 15 is threaded to the boss 13 and inclosesthe upper end of the stem 11 and protects the same and the opening inthe cover 12, through which said stem moves. This cap 15 is removed fromthe cover l2 when it is required to unseat the valve 8 and is replacedto afford protection to the stem and prevent dirt and foreign matterfinding access into the opening in the cover 12 and into the barrel orcylinder, which would be liable to cause the valve S to stick, andthereby de- `feat the purpose of the invention.

The valve 8 fits the cylinder 6 suiirciently close to move freelytherein by gravitative action when the pressure of gas passing throughthe cylinder below the valve is suspended from any cause, yet preventthe passage of gas thereby to neutralize the up pressure supporting thevalve under normal conditions. The cap 15 may lit sufficiently loose toprevent the formation of a vacuum in the upper part of the cylinder whenthe valve descends and to allow escape ofany gas passing by the valveinto'the upper portion of the cylinder and cap. The same result may beeffected by Venting the upper portion of the cylinder or cap. y

Having thus described the invention, what is claimed as new is Agas-service safety-valve comprising a cas- Ving having a verticalcylinder, oifstanding coupling ends intermediate of the upper and lowerends of the cylinder, the inlet-coupling end having communication withthe cylinder at a point between its ends, a passage connecting theoutlet-coupling end with the bottom of the cylinder, a strainer locatedin the inlet-coupling end, a cover closing the upper end of the cylinderand having a verticallyapertured boss, the upper end of the openingbeing enlarged, a valve freely movable vertically within the cylinderand having its stem passing loosely through the opening of the cover,said valve being held above the inlet by the pressure of the gas andadapted to be held seated when closed by the same pressure, the inletbeing wholly below the valve when the latter is open and entirely' abovethe said valve when the latter is seated, and a cap fitted to the bossof the cover for inclosing the upper end of the valve-stem,substantiallyas specilied.A

In testimony whereof I affix my signature in presence of two witnesses.A

LATHAM M. OSBORNE. [L s.] Witnesses:

JNO. Q. COCHRANE, GEORGE H. JOHNSTON.

